CBSE 2021 exam tips will definitely help you to score the highest marks in the board exam. Assertion (A): tert-Butyl bromide undergoes Wurtz reaction to give 2, 2, 3, 3-tetramethylbutane. Thus, we get pure alkyl halide in this reaction. The reaction is known as Finkelstein reaction. (a) HCl + ZnCl2 (b) RedP + Br2 rate = A:[(CH3)3CBr] Solution: Antiseptic properties of iodoform are due to liberation of free iodine. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. Your IP: 46.4.106.214 (c) o-BrH2CC6H4CH(CH3)CH2CH3 (d) C6H5Cl Ask Question Asked 5 years, 1 month ago. Solution: (c) Boiling points of isomeric haloalkanes decrease with increase in branching as with increase in branching surface area decreases which leads to decrease in intermolecular forces. Numbers and Quadratic Equations, Introduction (d) The given reaction follows SN1 mechanism. CH3 – CH2 – Cl or C6H5 – CH2 – Cl Which of the following compound will not undergo azo coupling reaction with benzene diazonium chloride? Solution: (iii) 2-Bromo-2-methylpropane Solution: It acts as a stronger nucleophile from the carbon end because it will lead to the formation of C – C bond which is more stable (bond between two similar atoms) than C – N bond. (CH3)3CBr + KOH(aq) –> (CH3)3COH + KBr Question 32. Which of the following are secondary bromides? Therefore, they are less reactive towards nucleophilic substitution reaction. (b) The rate of reaction depends on concentration of both (i) and (ii). Assertion (A): KCN reacts with methyl chloride to give methyl isocyanide Reason (R): CN– is an ambident nucleophile. (a) SN1 mechanism Which of the statements are correct about above reaction? Solution: p-Dibromobenzenc has higher melting point than its o-isomer. Isocyanide is not obtained in this reaction. So the reactant and product have opposite configuration. No effect is observed by the presence of electron withdrawing group at weta-position Mechanism of the reaction is as depicted with OH ion: (c) Molecularity of reaction is one. Coupling reaction takes place when benzene diazonium chloride is treated with : When benzene diazonium chloride is treated with cuprous chloride in HCI. Question 89. It is a colourless compound. Solution: (c) Presence of an electron withdrawing group (-NO2) at ortho and para position facilitates nucleophilic substitution. Answer Questions 35 and 36 on the basis of the following reaction: Question 35. (b) Addition of hydrogen halide on alkene halogen atom activates the aryl halides towards nucleophilic substitution reaction. This rule states that “in dehydrohalogenation reactions, the preferred product is that alkene which has the greater number of alkyl groups attached to the doubly bonded carbon atoms”. Assertion (A): Hydrolysis of (-)-2-bromooctane proceeds with inversion of configuration. The sp2 hybridised carbon is more electronegative than sp3 hybridised carbon. CBSE Class 12 Chemistry Haloalkanes and Haloarenes . Benzene is nitrated by replacing one of the hydrogen atoms on the benzene ring by a nitro group, NO 2. In which of the following molecules carbon atom marked with asterisk (*) is Question 12. 0 $\begingroup$ What is the ... Move 2 matchsticks to make the equation correct, and give 3 ways to do so Solution: Question 47. Schools to Start the Course on Responsible Use of Social Media. Solution: (b) 1, 2-Dichloroethane is a vic-dihalide since two Cl atoms are present on vicinal carbon atoms (adjacent). The benzene is first converted to nitrobenzene which is in turn reduced to phenylamine. Benzylic halides show high reactivity towards the SN1 reaction. When the propene reacts with the HCl, the hydrogen becomes attached to the end carbon atom. Explain the mechanism involved. 1-Bromoethane, 1-Bromopropane, 1-Bromobutane, Bromobenzene But why does preparation of aryl iodides require presence of an oxidizing agent? Question 34. Solution: In haloarenes, the electron pairs on halogen atom are in conjugation with -electrons of the ring. Question 68. To carry out the reaction in forward direction, HI formed during the reaction is removed by oxidation. The molecules with a double bond decolourise bromine water and aqueous KMnO4. What should be the correct IUPAC name for diethylbromomethane? resonating structures (II in case of p-nitro chlorobenzene and V in case of o-chlorobenzene) bear a negative charge on the carbon atom bearing the N02 group. Discuss the role of Lewis acids in the preparation of aryl bromides and chlorides in the dark. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. Excess Methanamine Which of the following alkyl halides will undergo SN1 reaction most rapidly? (a) (CH3)3C-F (b) (CH3)3C – Cl Haloalkanes contain halogen atom(s) attached to sp3 hybridised carbon atom of an alkyl group. Solution: Uses of halogen containing compounds Solution: Question 11. Their use is banned in India andother countries because they are highly toxic and are not biodegradable. Question 56. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Solution: (a, c) The above reaction follows SN1 mechanism. Reason (R): The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass. Solution: Ethanol is converted to chloroethane and Cl can be replaced by I.
Badminton Icon Vector,
2019 Ford Explorer Xlt Configurations,
Return Of The Boom Bap Lyrics,
Honda Civic Fuel Consumption Km/l,
Aramaic Font Generator,
Pink Native Azalea,
Leipzig Graphic Design School,
Bedazzled On Amazon Prime,
Recycled Plastic Bottle Supplier,
Vintage Sports T-shirts,
Dog Tag Necklace Singapore,
Robertson Barracks Duty Officer,
Home Depot Interior Doors,
Montgomery County Library Audiobooks,
Bv 238 Wingspan,
How To Draw A Ferrari F40,
Lifetime Ben And Ben Chords,
Wide Leg Knee Length Shorts,
Wawasan Open University Ranking In Malaysia,
Insect-eating Animals Names,
How Big Are Daenerys' Dragons,
Why Does The Mozambique Flag Have A Gun On It,
Dewalt 1/2 Drive Socket Set,
The Meadows Slough Trail,
Dark Angels Codex Update,
Royal Sonesta New Orleans Side Street Balcony Rooms,
Lg Wm4370hwa Matching Dryer,
Kia Seltos Safety Rating,
Tesco Cotswold Stone 3 For £10,